216 GLOSSARY OF BOTANICAL TEEMS. 



GLOSSARY OF BOTANICAL TERMS. 



A, in composition, signifies without, as aphyllus, without leaves. 



ABNORMAL, differing from the usual form. 



ABORTIVE, an imperfect development of an organ. 



ABRUPT, suddenly narrowing to a short point, not continuous. 



ACCESSORY, something added to the usual number of organs, as 

 Tendrils, Prickles, Glands, &c. 



ACCUMBENT, lying upon ; employed in Cmciferce, to signify that 

 the radicle lies upon the edge of the cotyledons. 



ACEROSE, needle-pointed, tapering and sharp, as in the leaves of 

 many of the firs. 



ACHENE, a small, dry, hard, one-seeded fruit, closely invested 

 with its pericarp, but separable. 



ACHLAMYDEOUS, without floral envelopes. 



ACICULAR, needle-shaped. 



ACOTYLEDONOUS, plants without cotyledons. 



ACROGENOUS, growing only at the summit, without increasing in 

 diameter, as in Ferns and Mosses. 



ACULEATE, bearing prickles. 



ACUMINATE, having a long tapering point. 



ACUTE, sharp, ending with an acute angle. 



ADHERING, parts uniting, as a calyx to an ovary. 



ADNATE, growing to or upon, as the anthers combining their 

 whole length with the filament. 



ADPRESSED, objects closely pressed to anything. 



ADVENTITIOUS, not following the usual course of development. 



ESTIVATION, the folding of the calyx and corolla while in the 

 bud, before expansion. 



AGGLOMERATED, collected in a head. 



AGGREGATED, gathered closely together. 



ALJS, wings, as the two side petals of a papilionaceous corolla. 



ALBUMEN, the substance surrounding the embryo to support the 

 young plant ; often absent, then the seed is said to be ex- 

 albuminous. 



ALBURNUM, the young wood before arriving at maturity; sap- 

 wood. 



ALTERNATE, when placed opposite the intermediate space, as in 

 leaves on a stem. 



AMENTUM, a closely-combined spike of male or female flowers, as 

 in the willows ; a catkin. 



AMPLEXICAUL, clasping the stem in the greater part of its cir- 

 cumference. 



ANATROPOUS or ANATROPAL, an ovule where the hilum and inicro- 

 pyle are close together, and the chalaza at the opposite end. 



ANASTOMOSING, veins uniting at their ends. 



